Finding the Fourth Proportional to 5,111.90, 7,660.23 and 2,643.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.90 : 7,660.23 = 2,643.42 : x
2. Step 2: Convert to fraction form
   5,111.90/7,660.23 = 2,643.42/x
3. Step 3: Cross multiply
   5,111.90x = 7,660.23 × 2,643.42
4. Step 4: Simplify right side
   5,111.90x = 20,249,205.19
5. Step 5: Solve for x
   x = 20,249,205.19/5,111.90
6. Step 6: Final answer
   x = 3,961.19